Flowserve HV 215 - Manual (Page 17)

7
Bottom valve HWV 205/1 - DN 80
Installation
– continued –
The supplied bottom valve consists of two component parts - the valve head and the body with the actuating
cylinder. The valve comes with a set of assembly parts.
The assembly parts of the valve head comprise:
n
Gasket ∅ 25
n 2 Locking washers
n 2 Socket head cap screws M6 x 30
First attach the valve head from the outside to the valve mounting flange.
See drawing on page 9
. Put the gasket
6 onto the valve head.
2. Place the valve head onto the mounting flange and insert the supplied socket-head cap screws c and locking
washers d in the valve mounting flange and tighten them with a torque of 20 Nm. Apply a commerically
available lubricant to the screws and tighten them in several steps in diagonally opposite pairs.
3. Check spacing between bottom of valve plug e and seat flange 7 (reference dimension see page 9). For this
purpose you can hold a try square to the bottom of the valve head and read off the distance to the bottom of the
valve plug. A distance of 7± mm is required. If the reading exceeds this tolerance check the position of the
seal of the valve plug e. If necessary push the valve plug e slightly upwards.
Dirty seals or the incorrect position of the valve plug seal may have caused this problem. Should even after
this examination the actual readings still exceed the specified tolerances, please contact our Technical Service in
your country, stating the Gestra manufacturing number indicated on the name plate.
31
31
Attention
Check and, if necessary, clean sealing surfaces.
The specified torques must be strictly observed.